Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4732875 | Journal of Asian Earth Sciences | 2006 | 7 Pages |
Abstract
We dated two rhyolitic lava plateaus, the Yamakogawa rhyolite and the Haneyama rhyolite, that are assumed to have erupted within a short time interval, in the middle of the Hohi Volcanic Zone, central Kyushu, Japan. The groundmass with phenocrysts removed was dated by the conventional K–Ar method using peak-height comparisons without an 38Ar spike.Our results show that the Yamakogawa rhyolite erupted more than once over a short time interval, from 1.17 to 1.22 Ma. The Haneyama rhyolite is distinctly younger, ranging from 0.67 to 0.71 Ma. The Yamakogawa rhyolite is slightly older than, and therefore probably unrelated to the Yabakei pyroclastic-flow deposit and other known widespread tephra.
Related Topics
Physical Sciences and Engineering
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Geology
Authors
Kunimi Yamada, Takahiro Tagami, Hiroki Kamata,